The black rubber hose that goes from the passanger side valve cover to the Throttle Body has managed to suck in a good amount of oil from my engine. I was wondering if anyone knew if there would be any problems with me capping off the TB where the rubber hose goes into it and installing a breather in the place of the rubber hose on the valve cover instead? Thanks.

 

Have you tried a search about breathers? It has been extensively discussed.

 

What should I do?

 

Try replacing your PCV valve

 

I have done it, no probs.

 

^So you've basically pulled all the vacuum off the crankase accept the PCV valve correct?

I am thinking about going that route with the PCV valve being the only thing pulling vacuum and breathers on both valve covers. Anyone think this is a decent Idea for a N/A LT1 with lots of nitrous?

 

The PCV system is the only thing that sucks air out of the crankcase. It doesn't put the crankcase under any vacuum. All it does is suck out the oil/gas/water vapors from the crankcase.

I'm running 2 breathers with my pcv valve still hooked up but it goes into a catch can instead of running straight to the manifold.

 

All I have done is put a beather on the fresh air side of the pcv system, (pass valve cover) I have always had a pcv valve in place and been changed every 30k, that hose just pulls filtered fresh air from the intake, the EXACT same thing a breather does, its just and open vs. closed system.

There is still vaccum on the pcv pulling crank case vapors, the breather is just allowing fresh air into the crankcase to replace the vapors drawn into the intake through the pcv.

I put a breather on mine because when you are under load there is no vaccum in a motor to pull fresh air, I was getting a little oil push back into the intake from that hose. Not a big deal but an easy fix with a breather.

 

You would be supprised how much oil the pcv valve sucks in without a catch can.

 

I think you are quibbling over semantics.... sucks = vacuum.... All it does is "vacuum" out the oil/gas/water vapors from the crankcase.

 

In high G, high RPM turns, I have filled the valve cover to the point where it causes the vent tube to go solid and slug of oil gets ejected through the tube.

I put a vented catch can on the line and it worked fine. It's just a PITA to drain with a hot motor.

Solution?

I drilled a hole in the oil filler neck, just below the cap. I was able to screw in a barbed fitting into the hole, in essence tapping the plastic to screw in the barbed fitting. I then routed the vent line to the TB.

The line is far enough up the filler neck that it ONLY evacuates the crankcase vapors.

I then plugged the old vent hole
Simple, cheap solution.

 

Yes the pcv valve "vacuums" out the vapors, but it doesn't put the crankcase under a vacuum like some people think. It's the same concept as a vacuum cleaner, it sucks up the dirt but it doesn't put your whole house under a vacuum.

 

I still have my PCV valve and vacuum line connected, however, I removed the air inlet tube from the throttle-body to passenger side valve cover and added breather filters on each valve cover. This configuration works well for me.

WD

 

You need to understand the technical meaning of "vacuum". If you have a vent source that is at atmospheric pressure (breather or the line to the valve cover) on one side, and a vacuum source (PCV valve) on the other, everything between those two points is at a pressure which is less than atmospheric = vacuum.

If you have excessive blowby, and the amount of gasses getting past the rings is greater than the vacuum source can evacuate, the system may actually be under pressure, causing the gasses to vent through both the PCV valve, and the breather or line to the valve cover.

Your vacuum cleaner analogy is flawed. A vacuum cleaner is taking suction (vacuum) at virtually the same point it is discharging air from the pressure side of the fan into the room. There is no net change in infiltration thtough the windows or cracks in the house.

 

So you are saying that a 3/8 line that is restricted by the PCV valve can put the crankcase under vacuum when there is a free flowing 1/2" line letting air in? The pcv system works in the same sense as a vacuum, while the pcv valve sucks out air it is being replaced by the 1/2" line at the same time. There is no vacuum in the crankcase. That's like saying a kitchen fan puts your whole house in a vacuum.